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  <title>Read data from shared memory block</title>

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</div><hr /><div id="function.shmop-read" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">shmop_read</h1>
  <p class="verinfo">(PHP 4 &gt;= 4.0.4, PHP 5)</p><p class="refpurpose"><span class="refname">shmop_read</span> &mdash; <span class="dc-title">Read data from shared memory block</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.shmop-read-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="type">string</span> <span class="methodname"><strong>shmop_read</strong></span>
    ( <span class="methodparam"><span class="type">int</span> <code class="parameter">$shmid</code></span>
   , <span class="methodparam"><span class="type">int</span> <code class="parameter">$start</code></span>
   , <span class="methodparam"><span class="type">int</span> <code class="parameter">$count</code></span>
   )</div>

  <p class="para rdfs-comment">
   <span class="function"><strong>shmop_read()</strong></span> will read a string from shared memory block.
  </p>
 </div>

 <div class="refsect1 parameters" id="refsect1-function.shmop-read-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">shmid</code></em></dt>

     <dd>

      <p class="para">
       The shared memory block identifier created by 
       <span class="function"><a href="function.shmop-open.html" class="function">shmop_open()</a></span>
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">start</code></em></dt>

     <dd>

      <p class="para">
       Offset from which to start reading
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">count</code></em></dt>

     <dd>

      <p class="para">
       The number of bytes to read
      </p>
     </dd>

    
   </dl>

  </p>
 </div>

 <div class="refsect1 returnvalues" id="refsect1-function.shmop-read-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns the data 或者在失败时返回 <strong><code>FALSE</code></strong>.
  </p>
 </div>

 <div class="refsect1 examples" id="refsect1-function.shmop-read-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-3633">
    <p><strong>Example #1 Reading shared memory block</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$shm_data&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">shmop_read</span><span style="color: #007700">(</span><span style="color: #0000BB">$shm_id</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">50</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
  <p class="para">
   This example will read 50 bytes from shared memory block and place the data
   inside <em>$shm_data</em>.
  </p>
 </div>

 <div class="refsect1 seealso" id="refsect1-function.shmop-read-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.shmop-write.html" class="function" rel="rdfs-seeAlso">shmop_write()</a> - Write data into shared memory block</span></li>
   </ul>
  </p>
 </div>

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